Deliverables

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D5.1 Current EMC standards and gaps detected regarding FEVs

Executive Summary

This document describes the work carried out in the HEMIS project relating to the analysis of existing automotive EMC standards.

The deliverable has been split into Electromagnetic Compatibility (EMC) considerations and Electromagnetic Field (EMF) considerations. The current situation regarding the applicability of automotive EMC standards is lacking in test limits and methodology to fully account for the different electromagnetic environment generated by a fully electric vehicle (FEV).  A summary of the identified areas where the range of available standards is lacking is shown in Appendix A.

The movement from the use Automotive EMC directive 2007/46/EC to the widespread introduction of UNECE regulation 10 results in this report concentrating on Regulation 10.  As UNECE regulation 10 is more recent, it makes reference to tests to be carried out when a vehicle is in a charging state, however component EMC testing and whole vehicle testing are less well covered.  UNECE regulation 10 calls on a range of CISPR and ISO standards (CISPR 12, CISPR 25 and ISO 11452) which do not fully define the tests needed to reflect the features of an electric powertrain. Although the versions of CISPR 12 that are referenced by the Automotive EMC Directive and UNECE Regulation 10 are different, both include specific requirements for measuring emissions from the electrical powertrain. However, further adaptations involving the way the vehicle is operated during a whole vehicle test will need to be applied, due to the differing characteristics of the electric powertrain from the more traditional internal combustion engine (ICE).

Component level EMC is also currently aimed at internal combustion engines, with UNECE Regulation 10 referencing the 2nd Edition (2002 plus 2004 corrigendum [42]) version of CISPR 25. There is a currently a 3rd Edition available and a 4th Edition under development. The 4th Edition of CISPR 25 may need more adaptation to cope with electric propulsion systems, due to the fact that the emissions are highly influenced by the load on the systems.  Another consideration is related to the component testing is the definition of the ground plane in the case when the bodyshell is made from a composite material.

Regarding human exposure to electromagnetic fields, although there are generic recommendations that ought to be taken into account, there are currently no relevant product standards that specify how to measure in-vehicle field levels and interpret the results in terms of the recommended exposure limits. The recent development of an IEC standard to try and take this into account has been proposed. For wireless inductive charging systems, however, methods for assessing electromagnetic field exposure will be required for both vehicle occupants and bystanders.

Electric vehicles are currently under represented in the EMC and EMF standards that relate to vehicles. In house standards are often more detailed, but the official standards (i.e. CISPR, BS, ISO and EN) are lacking in information, test methodology and emission limits. As part of the HEMIS project it is hoped that some of the gaps present in the existing standards can be closed, and that this will result in a more robust base to ensure EMC across the full electric vehicle range.

 

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Project acronym:
HEMIS

Project name:
 Electrical powertrain Health Monitoring for Increased Safety of FEVs


Project reference:
FP7-ICT-314609

Start date: 01/06/2012
End date: 30/11/2014


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